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Q. Van-Arkel method of refining Zirconium involves,

KCETKCET 2016General Principles and Processes of Isolation of Elements

Solution:

The van-Arkel method of refining zirconium involves removal of all oxygen and nitrogen impurities.

In this method, the impure metal is heated with iodine in a sealed vessel, so that metal forms volatile metallic iodide and impurities do not react with iodine.

The metallic iodide is then decomposed when purified further at higher temperature.